html,body{
    width: 100%;
    height: 100%;
    background-color: #222d32;
}
.panel{
    width: 400px;
    margin-top: 200px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    .panel-title{
        height: 50px;
        text-align: center;
        line-height: 50px;
        font-size: 24px;
    }
}